Trestle.



E. W. 650. A. OORNETT.

TRESTLE.

APPLIOATION FILED AUG.15, 1908.

Patented June 1, 1909.

INVENTORS Wmoore Atlornay WITNESSES C. Bum/4 UN i1 STA FFICE.

EMMET W. CORNET'I AND CON A. OORNETT, OF SPRING VALLEY, VIRGINIA.

TBESTLE.

To all whom it may concern:

Be it known that we, EMMET W. ConNn-r'r and CON A. CORNE'IT, citizens of the United States, residing at Spring Valley, in the county of Grayson and State of Virginia, have invented certain new and useful Improvements in Trestles, of which the following is a specification.

Our invention relates to improvements in trestles, and has for its objects the provision of a device of this character which may be easily manipulated to suit different conditlons of work, slmple in construction and operation and comparatively cheap in first cost.

To this end the invention consists in a trestle adjustable as to its height and length by means of devices which may be operated with facility.

The invention further consists of certain novel features of construction and arrangements of parts.

In the accompanying drawings we have illustrated one example of the physical embodiment of our invention constructed according to the best mode we have so far devised for the practical application of the principles.

Referring to the drawings, Figure 1 is a side elevation of a trestle embodying the novel features of our invention, extended to full length laterally, and raised nearly to its highest adjusted vertical position. Fig. 2 is a sectional view on line 22 Fig. 1 and Fig. 3 is a vertical sectional view of the trestle.

The two end supporting posts 1 comprise the upright legs 22 which are securely and rigidly connected to each other at the top by a cap 3 and the foot piece 4. Each supporting post 1 is thus formed with a vertical slot 5 and in this slot 5 the ends of the connection beams 6 are adapted to be raised and lowered. The ends of the beam 6 are provided with metallic pieces having a screw threaded perforation 7 therein and the end of the beam is also bored out in alinement with the perforation 7. Through these per- At its upper end said bar 8 is provided with a hand wheel 11 by means of which the Specification oi Letters Patent.

Application filed August 15, 1968.

Patented June 1, 1909.

Serial No. 448,652.

threaded bar may be turned. The bars 8 and 8 are held by the sleeves or bearings 12 located at the upper end of the supporting posts 1 and the wheel 11 may be bed to the post 8 by means of a pin 13. At t ieir lower ends the bars 8 and 8 carry bevel gears 14 and 15 respectively. These wheels 14 and 15 are engaged by the wheels 16 and 17 which latter are carried by shafts 18 and 19, rotatable in bearings 20 and 21. Preferably the shafts 18 and 19 are extensible and to this end larger shaft 19 is bored out to receive the smaller shaft 18. A slot 22 in the shaft permits the pin 23 to travel therein and insures a rotation of the shafts.

The connecting bar 6 is extensible and comprises essentially two members 24 and 25, the forked member 24 being provided with a long slot 26 in which the member 25 is adapted to slide. In the sliding movement the members are guided by means of bolts 27 which are stationary in the forked member 24 and which passes through the slots 28 in the member 25. Thus it will be observed that the extensible bar 6 is movable laterally within the limits of the length of the duplicate slots 28.

When it is desirable to use the trestle as a low-down trestle the end wheel 11 is turned counter clock-wise and in as much as the threaded bar 8 is held against vertical movement by means of portion 9 in its socket 10, by turning wheel 11 the bar 8 and its wheel 14 are rotated, which rotates wheel 16, shafts 18 and 19, wheels 17 and 15, and bar 8. The beam is thus forced down at both ends by the screw feed of bars 8 and 8. To raise the beam to a greater height the hand wheel 11 may be turned in a clock-wise direction and the screw will thus lift the beam tp the desired height within the limits of the s 0t 9.

To lengthen the extension beam the two members 24 and 25 are pulled away from each other, the members being guided in their movement by means of bolts and slots as described above and in their extended position these members may be rigidly fastened together by means of the nuts 29. The beam-is guided in its vertical movement by means of the braces 30, 30, 30, 30, which are bolted at their upper ends to the connecting beam. The lower free ends of the braces are cut away at 31 to partially surround the upright 2 to form an efficient brace and guide.

From the above description taken in connection with the drawings it is obvious that we have provided a device of this character which will perform the functions of a desirable trestle and it is evident that we have produced a device which fulfils the objects of our invention.

Having thus fully described our invention, what we claim as new and desire to secure by Letters Patent, is:

'1. In a trestle, the combination with the supporting posts, an extensible connecting bar, means combined with the supporting posts for raising and lowering said bar, said means'consisting of a pair of vertical screws in the vertical posts, horizontal beveled gears on the lower end of said screws, vertical beveled gears meshing therewith, and a horizontal shaft carrying the vertical beveled gears and made extensible to permit the horizontal adjustment of the connecting bar and horizontal shaft simultaneously.

2. The combination with supporting members, of a connecting bar composed of two members, one of said members having guide slots and the other of said members provided with transverse bolts adapted to move in said slots, and means for adjusting the connecting bar in said members consisting of a horizontally extensible shaft, a vertical beveled gear on each end of said horizontal extensible shaft, and a pair of screws carrying beveled gears for engaging the gears on the connecting bar.

3. In a trestle, the combination of end supporting posts, a horizontal adjustable member connecting said posts, a horizontal bar arranged parallel to the connecting member and consisting of two parts adjustable to correspond to the adjustment of the connecting member, vertical screws engaging the ends of the horizontal adjustable connecting member, beveled gears on the lower ends of said screws, and beveled gears-on the ends of the horizontal adjustable bar meshing with the beveled gears on the lower ends of the EMMET W. OORNETT. CON A. CORNETT.

Witnesses:

JOHN B. VAUGHAN, ROBY ROBERTS. 

